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. 2020 Jan 19;14(3):294–301. doi: 10.1111/irv.12712

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© 2019 The Authors. Influenza and Other Respiratory Viruses Published by John Wiley & Sons Ltd.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Antibody levels against H1N1pdm09 NS1 (A) and HA (B) measured by LIPS in human plasma from laboratory‐confirmed influenza (LCI) cases, vaccinated cases and controls. Antibody levels are shown as the mean fold increase in luminescence (light units, LU) relative to the negative control. Error bars indicate the range for each group. H1N1pdm09 seropositive and negative samples are shown in closed and open circles, respectively. (Note seropositivity is defined according to a statistically based cut‐off value for each individual run, and not by fold increase.)